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Finding the Fourth Proportional to 280.19, 386.90 and 267.66

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Solution

The fourth proportional to 280.19, 386.90 and 267.66 is: 369.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.19 : 386.90 = 267.66 : x
  2. Step 2: Convert to fraction form
    280.19/386.90 = 267.66/x
  3. Step 3: Cross multiply
    280.19x = 386.90 × 267.66
  4. Step 4: Simplify right side
    280.19x = 103,558.49
  5. Step 5: Solve for x
    x = 103,558.49/280.19
  6. Step 6: Final answer
    x = 369.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.